/Engine/Source/Runtime/Core/Public/Containers/Set.h
Serializer.
template<typename ElementType, typename KeyFuncs, typename Allocator> static [FArchive](API\Runtime\Core\Serialization\FArchive) & Serialize ( [FArchive](API\Runtime\Core\Serialization\FArchive) & Ar, [TSet](API\Runtime\Core\Containers\TSet)< ElementType, KeyFuncs, Allocator > & Set )